leetcode Longest Valid Parentheses
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#include <vector>class Solution {public: int longestValidParentheses(string s) { int r = 0; int r_max=0; int pl= 0; vector<int> app; for(auto i=s.begin();i<s.end();i++){ if (*i=='(') { pl++;app.push_back(r);r=0;} else if (*i==')'){ if (pl>0) { pl--;r+=app.back()+2;app.pop_back();} else r=0; } if (r>r_max) r_max=r; } return r_max; }};
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